Furnace.



J. DONALD & T. r DOWNEY.

FURNACE.

APPLICATION FILED AUG. 12, 1909.

Patented Sept. 20, 1910.

2 8EEETSSK EET 1.

-J. DONALD 6: T'. P. DOWNEY.

r'unmon. APPLIOATION FILED AUG. 12, 1809.

970,805. 1 Patented s 20,1910.

2 B TB-BHBBT 2.

UNITED STATES OFFICE.

JAMES DONALD AND THOMAS F. DOWNEY, OF CHICAGO, ILLINOIS.

FURNACE.

To all whom it may concern:

Be it known that we, JAMES DONALD and THOMAS F. DOWNEY, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to the furnaces of steam boilers.

The arches or the top walls of steam boiler furnaces, as heretofore constructed, have in some instances consisted of tiles supported upon pipes, tubes, bars or the like. When a tile became damaged and replacement was necessary, all of the tiles between the damaged one and the outer side of the wall had to be removed before the damaged tile could be taken out.

It is one of the objects of this invention to provide tiles for a furnace arch or wall which can be readily removed whenever desired without disturbing any of the adjacent tiles.

The invention also relates to the further improvements in furnaces hereinafter set forth.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of a furnace embodying the features of our invention. Fig. 2 is a fragment-a1 front elevation with parts in section. Fig. 3 is a top plan view of the furnace. Fig. 4 is an enlarged detail View illustrating the tiles in place upon the su porting members. Fig. 5 is a fragmentaf under side view of one of the tiles.

In the embodiment selected for illustration, the furnace comprises the front wall 1, the side walls 2, the top wall or arch 3, the bridge wall 4, the grate 5 the combustion chamber 6, and the ash pit The side walls 2 comprise four parallel plates 8, 9, 1 0 and 11, which may be secured at their lower ends to angle irons 12 and at their upper ends to channel bars 13. Extending transversely of the plates 8, 9, 10 and 11, across the top of the furnace, is a series of air tubes 14. The tubes 14 are staggered; one tube extends through the plates 8, 10 and 11 and communicates at one end with the atmosphere and at its other end with the space between the plates 8 and 9; and the next tube extends through the plates 8, 9 and 10 and communicates at one end with the atmosphere and at its other end with the space between the plates 10 and 11.

Specification of Letters Patent. Patented Sept, 20, 1910,

Application filed August 12, 1909.

Serial No. 512,532.

The spaces between the plates 8, 9, 10 and 11 communicate with the interior of the furnace in any suitable manner. \Ve have herein shown air ducts or passages 15 extending from the lower ends of said spaces to the ash pit 7, and ports 15 communicating with the interior of the combustion chamber at a suitable distance above the grate. It will be understood that these passages may be of any suitable form and arrangement.

Preferably means is provided for admitting air to the combustion chamber from above the fire. We have herein shown openings 16 in the air tubes 14, which openings communicate with inlet openings 17 formed in the tiles supported by said air tubes. The openings 16 may be of any suitable shape.

Referring now to Figs 1 and 5: 18 is a tile having parallel sides 19 and 20 and a lower side 21. The upper portion of the tile has a concave surface 22 to fit upon one of the tile-supporting members, as for example, one of the air tubes 14, and a concave portion 23 to fit against the adjacent supporting member. The upper end of the tile 18 consists of the parallel sides 24 and 25, the upper side 26, and the inclined side 27. The plane in which the axes of the adjacent supporting members 14: lie is indicated in Fig. et by a dotted line a. It will be seen that the portion of the tile 18 above said plane is narrower than the distance between two adjacent supporting members. The tile 18 is held from falling downward between the supporting members by means of a key section or tile 28, which tile has a concave surface 29 to rest upon one of the supporting members, an inclined side 30 against which the side 27 of the tile- 18 may rest, a side 31 against which the side 24 of the tile 18 may rest, an upper side 32, and a side 33 to lie adjacent to the side 25 of the tile 18. It will be apparent .from Fig. 1 that the key section 28 when in place upon one of the supporting members will prevent the tile 18 which lies against the side 31 of said key section from fallin out of place, and that when said key section is removed, said tile 18 may be removed without disturbing the adjacent tiles. In order to remove the tile 18 without disturbing adjacent tiles, said tile 18, in the form herein shown, must be withdrawn in a straight line, hence the ,walls 19 and 20 of said tile are straight and parallel. In order that the concave surface r 22 may clear the supporting member with .posed through said space. V I

As shown in Fig. 4, the narrow upper.

which it contacts, the withdrawing movement must be at an angle other than a right angle with the axial plane a of the series of supporting members, hence the sides 19, 20 and 27 of the tile 18 are inclined at an appropriate angle with said axial plane.

It will be noted by reference to Fig. 1 that the joints or rather lines of division between the lower portions of the tiles 18 are inclined rearwardly in a downward direction, i 6., in the general direction in which the products of combustion travel; hence, should there happen to be a slight crack or space between adjacent tiles the highly heated gases do not enter said space,

but continue in their movement to the rear, thereby avoiding injury to the tube 14 exportion of the tile 18 does not extend midway between the two supporting members, but, on the contrary, is nearer to. one of said members than it is to the other, in order to permit the upper end of said narrow portion to pass through the space between said supporting members when the tile 18 is withdrawn. Because of the angular form of the tile 18, the lower portion thereof tends to swing to the left (Fig. 4) so as to hang vertically, thus giving the upper portion of the tile a tendency to swing to the right. These tendencies are resisted by the locking tile 28 which is wedged or held in the'space between the narrow upper portions of the tile and the opposite supporting member 14. In this instance the openings 17 are pro vided by forming grooves of any suitable form in one of the walls 19 and 20 of the tiles 18. hen the tiles are in place, said grooves form, in conjunctionwith the adjacent side of the adjacent tile, a port or opening extending from the opening 16 in the air tube to the combustion chamber.

In the operation of the furnace herein shown, air enters the outer ends of the air tubes 14, and is drawn through said tubes, passing downward in the spaces between the plates 8, 9,10 and 11, and into the ash pit. In passing through thetubes 14 and the spaces between the plates 8, 9, 10 and 11,

the air is warmed previous to its admission to the fire.

, lVhen a tile 18 becomes damaged and must be replaced with anew tile, the corresponding key 28 is removed in an upwardly direction, whereupon the damagedtile 18 may be withdrawn downwardly and without disturbingany of the other tiles.

It will be understood that so far as the tiles are concerned, the members for supporting them may be solid bars, water tubes, air flues, or of any other suitable character.

From an inspection of Fig. 2 it will be seen that the arch formed by the air tubes 14 and their tile covering is supported by the plates 8 9 1O 11 and independently of the brick lining for the side walls of the furnace; hence. said brick lining may be renewed without tearing down or disturbing thearch.

e would have it understood that we desire not to be limited to the precise details of construction herein shown and described,

for various modifications will occur to persons skilled in the art.

lVe claim as our invention: 1. A furnace tile construction comprising a tile having a concavity formed in one of 2 its sides, the sides of said tile below said concavity being'straight and parallel, the portion of the tile above said concavity being narrower than the portion below said concavity, said portions extending at an angle with each other, a locking tile adapted to lie in contact with the narrow upper portion of the first mentioned tile, and sup- 7 porting means lying in contact with said concavity and said locking tile, said locking cavity, a locking tile adapted to lie in conl tact with the narrow upper portion of the first mentioned tile, the locking tile having a concavity therein, the two concavities being in opposite sides of the pair of contacting tiles and supporting means lying in contact with said concavities.

3. A furnace tile construction comprising a tile having a concavity formed in one of its sides, the sides of said tile below said concavity being straight and parallel, the portion of said tile above said concavity being narrower than the portion below said concavity, a locking tile adapted to lie in contact with the narrow upper portion of the first mentioned tile, the locking tile having a concavity therein, the two concavities being in opposite sides of the pair of contacting tiles, said straight parallel sides being inclined at anangle other than a right angle to a plane passing through the centers of the circles on which the concavities are formed and supporting means lying in contact with said concavities.

4. A furnace tile construction comprising a tile having a concave surface 22, two straight parallel sides 19 and 20, two sides 24 and 25 and an inclined surface 27, a locking tile having a concave surface 29, two parallel surfaces 31 and 33, the surface 31 being adapted to lie in contact with the surface 24,

. and an inclined surface 30 adapted to lie in contact with the surface 27 and supporting means lying in contact with the concave surfaces 22 and 29.

5. A furnace arch comprising a plurality of supporting members spaced apart and arranged in a plane, a tile extending between every two adjacent supporting members and contacting one of said members, a portion of said tile being above the plane of said members and a portion of the tile being below said plane, the portion above said plane being nearer to said contacted supporting mem her than to the other supporting member, and a locking member bearing upon said other supporting member and contacting the upper part of said tile.

, 6. A furnace arch comprising a plurality of supporting members spaced apart and arranged in a plane, and a plurality of tiles, one of said tiles extending between every two adjacent supporting members and contacting one of said members, a portion of said tile being above the plane of said members and a portion of the tile being below said plane,'the portion above said plane being nearer to said contacted supporting member than to the other supporting member, and a locking member bearing upon said other supporting member and contacting the upper part of said tile, the lower part of said tile contacting the lower parts of adjacent tiles to form a continuous covering for the under side of said supporting members.

7 A furnace arch comprisin a plurality of supporting members spacec l apart and arranged in a plane, and a plurality of tiles, one of said tiles extending between every two adjacent supporting members and contacting one of said members, a portion of said tile being above the lane of said members and a portion of the tile being below said plane, and a locking member bearing upon the other supporting member and contacting the upper part of said tile, the lower part of said tile contactin the lower parts of adjacent tiles, the ower parts of said tiles extending at an angle other than a right angle with the plane of said supporting members.

8. A furnace arch comprising a plurality of supporting members space apart and arranged in a plane, and a plurality of tiles, one of said tiles extending between every two adjacent supporting members and contacting one of said members, and a locking member resting upon the upper side of the other supporting member, said tile having a narrow upper portion which is contacted by the side of said locking member, said narrow portion being nearer to said contacted supporting member than to the other supporting member, the lower portion of the tile contacting with the lower portions of adjacent tiles.

9. A furnace arch comprising a plurality of tubes spaced apart and arranged in a plane, and a plurality of tiles, one of said tiles extendin between every two adjacent tubes and having a concave portion between its ends which is adapted to contact one of the tubes, the portion of the tile above said concavity being narrower than the portion of the tile below aid concavity, said lower portion contacting with the lower portions of adjacent tiles and having straight parallel sides which extend atan angle other than a right angle with the plane of said tubes, and a locking member bearing upon the upper side of the tube opposite to the one contacted by the tile, said locking member contacting the upper narrow portion of said tile.

10. A steam boiler furnace comprising side walls, a grate, and a fire arch, said arch comprising air tubes and a tile covering for said tubes, said side walls having air spaces therein with which said tubes communicate, said tubes also communicating with the atmosphere, said air spaces being arranged to discharge heated air into the spaces between said walls above and below said grate.

11. A steam boiler furnace comprising side walls, a grate and a fire arch, each of said side walls comprising two spaced plates forming between them a vertical air chamber, which chamber communicates with the spaces between said walls below and above said grate, said arch comprising air tubes supported by said plates and communicating withs'aid air chamber, said tubes communicating with a suitable sup ly of air, and a protective covering for SitlCFillI' tubes.

12. A furnace arch comprising a plurality of supporting members spaced apart and arranged in a plane, tiles extending between said supporting members at an angle other than aright angle with the plane of said supporting members, and a key section for each of said tiles, said key section being adapted to rest upon one of said supportin members and contact with the upper end of its tile.

13. A furnace having side walls, each of which side walls has an air space therein; air tubes extending from one side wall to the other, said tubes communicating at one end with the atmosphere and at the other end with said spaces; and a covering of tile for said tubes, said air spaces being 1n operative communication with the interior of the furnace said air tubes and tile forming the top wall of the furnace.

14. A furnace arch comprising two spaced supporting imembers, a tile extending through the space between said supportin members and extending to points above and below said members, the width of said tile below said members being substantially equal to the distance between centers of said supporting members, whereby said tile substantially fills the space below said support- 'ing' members, the portion of said tile above the supporting members being narrower than the portion below said members, said narrow portion being nearer to one of said supporting members than to the other, and a locking member resting upon said other supporting member and bearing against the upper part of the tile for holding the latter in place.

15. A furnace tile arch comprising a plurality of tiles each having a narrow upper,

portion and a broader lower portion, said portions extending at an angle with relation to each other, the broader portions of said t1les lying side by side in substantial contact with one another, locking tiles lying 7 between the narrow portions of said first being. disposed side by side, a series of archsupporting members, the broader portions of the tiles being below said supporting members, and the sides of said broader portions extending at an angle other than a right '1 r angle with the plane of said arch-supporting members, and means located at the upper side of said series of supporting members and engaging the narrow portions of the tiles, for locking them in place. 1

17. A furnace tile arch .comprising a phi-r rality of tiles each having a narrow upper portion and a broader lower portlon, sald' port-ions extending at an angle witheach other, the broader lower portions of said H tiles lying side by side, locking tiles lying between the narrow upper portions of" the first mentioned tiles, and filling the'spaces between said narrow portions, and a plu-r rality of supporting members, one support ing member lying between every two radjacent tiles and adjacent to the angle between the upper and lower portions of the tiles, said supporting members serving to support the arch.

JAMES DONALD.

THOMASF. DOWVNEY."

VVit-nesses J. RAYMOND BARS, GEORGE L. OHINDAHL. 

